Harmonic signaling device for telephone systems.



W. W. DEAN.

HARMONIG SIGNALING DEVICE FOR TELEPHONE SYSTEMS.

APPLICATION FILED SEPT. s, 1905.v l

1,125,493.- Patentd Jan. 19, 1915.

Wi b Home:

THE MORRIS PETERS CO., PHOTCLLITHO.. WASHINGTON. D. C

UNITE; @ALTES WILLIAM W. DEAN, oii ELYRIA,

OHIO; VCURTIS IB. CAMP, TRUSTEE, AIPPOINTED BY COURT.

IIARMONIC SIGNALING DEVIS E "EUR TELEPHONE SYSTEMS.

tisanes.

Speeication of Letters Patent.

Patented Jan. i9', iltll.

Application filed September 9, 1905. Serial No. 277,686.

To o'ZZ whom t may concern: j

Be it known that I, IVILLIAM W. DEAN, a citizen of the United States, residing at Elyria, in the county of Lorain and State of Gino, have invented certain new and useful Improvements in Harmonic Signaling Devices for Telephone Systems, of which the following is a specification, reference being had therein to the accompanying drawing.

My invention relates to harmonic selective signaling, and particularly to signal receiving devices therefor. Specifically stated,

-it has to do with the ringers at the substations on a polystation telephone line, and it has for its obiect the improvement of such devices as will be fully set forth hereinafter.

The essential features of my present ringer are, a stiff frame or yoke carrying the magnet cores, the gongs. and the permanent magnet used for polarizing the cores, pole pieces carrying a yoke. the yoke carrying the transverse spring, and the spring carrying the armature which in turn carries the clapper-rod and clapper. This clapper-rod and clapper constitute the tuned reed upon which I depend for determining the characteristic pitch of the individual ringer. and the yoke. spring and reed are so related that under normal conditions the clapper-rod and clapper are maintained in approximately a median position between the gongs. In determining the pitch of any timed body there are three factors to be considered. viz. the length. the mass. and the degree of tension. The mass of my reed is determined by the length and weight of the clapper as well as of the rod itself, the length of the reed is determined by the position of the clapper on the dapper-rod, and the tension is determined bv the stiffness of the spring which supports the armature and reed. Y

My invention is illustrated in the accompanving drawings. in which- Figure 1 is a top plan view of a ringer embodying the invention: Fig. 2 is a. side view of the same: and Fig. 3 is a detail.

In the drawings A designates the ringer magnets, wound on the cores a and a2, which are joined as well as carried by the iron yoke a. upon whose terminal eXtensions al are pivoted segments as carrying the gong posts c of the gongs C, and adjustable by means of the micrometer screws o6 working in the drop ears at, a5. The yoke also carries the permanent magnet a3 which extends down behind the electro-magnets and beneath the armature, which as well as the magnet cores it polarizes constantly.

Upon and across the free ends of the magnet cores a and a2 I mount a yoke B, adjustable up or down by means of the nuts I preferably make this mounting and adjust- `ment upon a sleeve around the core,but as the same forms-no part of my present invention this manner of mounting is immaterial. The yoke, with a transverse or cross portion hasl boubly returned ends b5. lThe major axis of the yoke lies in ay line passing through the center of thecore ends, and the minor or cross axis lies at right angles thereto. The armature b, which is of soft iron, lies parallel to the major aXis of the yoke and has a cross portion or extension 721 lying along the minor axis of the yoke and carrying the clapper-rod b3, preferably riveted to it. Upon the downturned ends b5 of the cross yoke I secure a iiat leaf spring 712. This is shown as screwed on, but obviously it may be held by rivets or in any other suitable manner. Between this spring and the yoke I place the armature, and secure it to the spring. the securing means shown being screws. Directly between the pole pieces, I form an opening b in the armature, and into this I enter the end of a pivot screw 67 tapped into the yoke 7150 and locked when adiusted by a nut bs. The purpose of this screw is to give a pivot bearing for the armature to turn upon, and as the movement of the armature is dependent upon a torsional strain of the spring in one direction or the other, the pivot point lies in the plane and against the upper face of the spring.

The operation of my improved signaling device or ringer is almost obvious from the description. The three factors of length. mass and tension are secured by means of the clapper rod b3 in its length and mass. the clapper bt in its length and mass, and the tension by the spring b2. The movement of the armature upon the point of the screw is perfectly smooth and satisfactory, and owing to the nature and stiffness of the parts a perfect adjustment can be made with very little diiiiculty. When current of the proper frequency passes through the windings A, the armature b receives repeated pulls upon its alternate ends which quickly set it into active vibration, until the clapper 254 is thrown against the gongs.

Any other' frequency than the proper one leaves the armature undisturbed. Y

Having thus described my invention what I claim Vand desire to secure by Letters Patent is:

1. A harmonic ringer comprising an electromagnet, a gong, a clapper rod and clapper, an armature rigidly associated With such clapper rod, a prismatic spring adapted to receive support from its ends and to carry such armature intermediate of its ends, such spring lying in a plane substantially parallel with suoli armature and adapted to be twisted when such armature is energized, and means for preventing such spring bending due to the attraction of such electromagnet.

" 2. A harmonic ringer comprising an electromagnet, a gong, a clapper rod and clapper, an armature rigidly associated with such clapper rod, a yoke secured to the op erating end of such electromagnet, a prismatic spring supported at its ends `from such yoke and to carry such armature intermediate o its ends, such spring lying in a plane substantially parallel with such armature and adapted to be twisted when such electromagnet is energized and a4 pivot for such spring intermediate its ends.

' 3. A harmonic ringer comprising an electromagnet, a pair or gongs, a clapper rod and clapper, an armature rigidly associated Vwith such clapper rod, a yoke secured to the normally maintain such clapper intermediate and out of contact With suchgongs and a pivot for such spring intermediate its ends. c

In testimony whereof I afiix my signature in presence of tWo Witnesses.

WiLLiAM W. DEAN.

Witnesses:

RAY II. MANsoN, S. A. BEYLAND.

Copies lof this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

